Description:
Computes a list of intervals from a list of points.
X->DX can be used for instance to get intervals from absolute pitches or to get a list of durations from time onsets:
Ex. (x->dx '(6000 6700 6900)) => (700 200)
Ex. (x->dx '(0 1000 1200 2000 5000)) => (1000 200 800 3000)
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